I am pretty happy with the Synology network drive I use for self-hosting email. Synology has developed a business email suite which comes with 5 mailboxes. You

I am pretty happy with the Synology network drive I use for self-hosting email. Synology has developed a business email suite which comes with 5 mailboxes. You can buy permanent additional mailboxes for the price of what you normally would pay yearly to big tech. The mailbox suite is fully featured with easy to setup anti spam measures and an intelligent spam filter you can train by forwarding spam and not spam messages to it. I can certainly recommend it should you want to self-host from home.